Solution 1: This is working as expected when using the Investment Domain and attempting to mix object types in field and measures. As referenced in the documentation excerpt below, use Team data when you want specific data about a team and its members. Additionally, Using mixed Calendar types is not supported and causes unexpected results in reporting so check to make sure that mixed Calendar types is not included in the report.
Excerpt from the Investment Management Domain
documentation for CA PPM:
"Do not mix object types when selecting from Fields and Measures. If you select Investment Name in the Fields area, select a total under the Investment Totals in the Measures area. Selecting a total from a different Measures object category (for example, Team Totals) could produce unexpected results. For Investment data, use investment fields and investment measures. To use Team data when creating an ad hoc view, select a team member field from the Team folder under Fields. Use a team amount from the Team folder under Measures. In general, use Investment data (Fields) with Investment metrics (Measures) and use Team data (Fields) with Team metrics (Measures). Use Team data when you want specific data about a team and its members (for example, resources or allocation start dates).
Solution 2: Additionally, check to make sure that the correct measures are used. If you are seeing the same data in each monthly column, this can be due to using Total Hours, make sure the hours are pulled under Measures in Projects->Calendar Periods->Project->Hours